docker/k8s常见错误处理

启动docker失败，报错了

启动docker失败，报错了。Failed to load environment files: No such file or directory

[root@mcwk8s05 ~]# systemctl start docker

Job for docker.service failed because a configured resource limit was exceeded. See "systemctl status docker.service" and "journalctl -xe" for details.

[root@mcwk8s05 ~]# journalctl -xe

-- Subject: Unit docker.service has failed

-- Defined-By: systemd

-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel

--

-- Unit docker.service has failed.

--

-- The result is failed.

.....

-- Defined-By: systemd

-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel

--

-- Unit docker.service has begun starting up.

Apr 18 00:33:44 mcwk8s05 kube-proxy[1006]: I0418 00:33:44.786333    1006 reflector.go:160] Listing and watching *v1.Endpoints from k8s.io/client-go/informers/factory.go:133

Apr 18 00:33:44 mcwk8s05 kube-proxy[1006]: I0418 00:33:44.788405    1006 reflector.go:160] Listing and watching *v1.Service from k8s.io/client-go/informers/factory.go:133

Apr 18 00:33:46 mcwk8s05 kube-proxy[1006]: I0418 00:33:46.143912    1006 proxier.go:748] Not syncing ipvs rules until Services and Endpoints have been received from master

Apr 18 00:33:46 mcwk8s05 kube-proxy[1006]: I0418 00:33:46.144004    1006 proxier.go:744] syncProxyRules took 185.651µs

Apr 18 00:33:46 mcwk8s05 kube-proxy[1006]: I0418 00:33:46.144024    1006 bounded_frequency_runner.go:221] sync-runner: ran, next possible in 0s, periodic in 30s

Apr 18 00:33:46 mcwk8s05 systemd[1]: docker.service holdoff time over, scheduling restart.

Apr 18 00:33:46 mcwk8s05 systemd[1]: Failed to load environment files: No such file or directory

查看这个环境文件

[root@mcwk8s05 ~]# cat /usr/lib/systemd/system/docker.service

[Unit]

Description=Docker Application Container Engine

Documentation=https://docs.docker.com

After=network-online.target docker.socket firewalld.service containerd.service

Wants=network-online.target

Requires=docker.socket containerd.service

[Service]

Type=notify

# the default is not to use systemd for cgroups because the delegate issues still

# exists and systemd currently does not support the cgroup feature set required

# for containers run by docker

EnvironmentFile=/run/flannel/subnet.env

发现这个文件是flannel运行时的临时文件。flannel没有启动。那么先启动flannel

[root@mcwk8s05 ~]# ls /run/

abrt        console     crond.pid    dbus         faillock   lock  mount      NetworkManager  sepermit  sshd.pid  svnserve     systemd     tuned  user  vmware

auditd.pid  containerd  cron.reboot  docker.sock  initramfs  log   netreport  plymouth        setrans   sudo      syslogd.pid  tmpfiles.d  udev   utmp

[root@mcwk8s05 ~]# ip a

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1

    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

    inet 127.0.0.1/8 scope host lo

       valid_lft forever preferred_lft forever

    inet6 ::1/128 scope host

       valid_lft forever preferred_lft forever

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000

    link/ether 00:0c:29:25:ef:dd brd ff:ff:ff:ff:ff:ff

    inet 10.0.0.35/24 brd 10.0.0.255 scope global eth0

       valid_lft forever preferred_lft forever

    inet6 fe80::3a1f:8b4:d1f1:9759/64 scope link

       valid_lft forever preferred_lft forever

3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000

    link/ether 00:0c:29:25:ef:e7 brd ff:ff:ff:ff:ff:ff

[root@mcwk8s05 ~]#

启动网络，然后启动容器，正常启动

[root@mcwk8s05 ~]# systemctl start flanneld.service

[root@mcwk8s05 ~]# ip a

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1

    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

    inet 127.0.0.1/8 scope host lo

       valid_lft forever preferred_lft forever

    inet6 ::1/128 scope host

       valid_lft forever preferred_lft forever

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000

    link/ether 00:0c:29:25:ef:dd brd ff:ff:ff:ff:ff:ff

    inet 10.0.0.35/24 brd 10.0.0.255 scope global eth0

       valid_lft forever preferred_lft forever

    inet6 fe80::3a1f:8b4:d1f1:9759/64 scope link

       valid_lft forever preferred_lft forever

3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000

    link/ether 00:0c:29:25:ef:e7 brd ff:ff:ff:ff:ff:ff

4: flannel.1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN

    link/ether 4e:bb:c2:5c:bf:37 brd ff:ff:ff:ff:ff:ff

    inet 172.17.98.0/32 scope global flannel.1

       valid_lft forever preferred_lft forever

    inet6 fe80::4cbb:c2ff:fe5c:bf37/64 scope link

       valid_lft forever preferred_lft forever

[root@mcwk8s05 ~]# systemctl start docker

[root@mcwk8s05 ~]# ip a

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1

    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

    inet 127.0.0.1/8 scope host lo

       valid_lft forever preferred_lft forever

    inet6 ::1/128 scope host

       valid_lft forever preferred_lft forever

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000

    link/ether 00:0c:29:25:ef:dd brd ff:ff:ff:ff:ff:ff

    inet 10.0.0.35/24 brd 10.0.0.255 scope global eth0

       valid_lft forever preferred_lft forever

    inet6 fe80::3a1f:8b4:d1f1:9759/64 scope link

       valid_lft forever preferred_lft forever

3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000

    link/ether 00:0c:29:25:ef:e7 brd ff:ff:ff:ff:ff:ff

4: flannel.1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN

    link/ether 4e:bb:c2:5c:bf:37 brd ff:ff:ff:ff:ff:ff

    inet 172.17.98.0/32 scope global flannel.1

       valid_lft forever preferred_lft forever

    inet6 fe80::4cbb:c2ff:fe5c:bf37/64 scope link

       valid_lft forever preferred_lft forever

5: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN

    link/ether 02:42:f6:d4:62:1b brd ff:ff:ff:ff:ff:ff

    inet 172.17.98.1/24 brd 172.17.98.255 scope global docker0

       valid_lft forever preferred_lft forever

[root@mcwk8s05 ~]#

一次k8s的node 是not ready的排查

检查状态没有准备好

[root@mcwk8s03 ~]# kubectl get cs

NAME                 STATUS    MESSAGE             ERROR

scheduler            Healthy   ok

controller-manager   Healthy   ok

etcd-1               Healthy   {"health":"true"}

etcd-2               Healthy   {"health":"true"}

etcd-0               Healthy   {"health":"true"}

[root@mcwk8s03 ~]#

[root@mcwk8s03 ~]#

[root@mcwk8s03 ~]# kubectl get nodes

NAME       STATUS     ROLES    AGE    VERSION

mcwk8s05   NotReady   <none>   166d   v1.15.12

mcwk8s06   NotReady   <none>   166d   v1.15.12

关闭防火墙

systemctl stop firewalld.service

node 上kubelet没有启动

[root@mcwk8s05 ~]# systemctl status kubelet.service

node上查看错误信息，查看到访问的是nginx负载均衡器的vip。

[root@mcwk8s05 ~]# tail -100f /var/log/messages

Apr 18 01:14:35 mcwk8s05 kubelet: I0418 01:14:35.110814    2985 reflector.go:160] Listing and watching *v1.Node from k8s.io/kubernetes/pkg/kubelet/kubelet.go:454

Apr 18 01:14:35 mcwk8s05 kubelet: I0418 01:14:35.118520    2985 setters.go:753] Error getting volume limit for plugin kubernetes.io/azure-disk

Apr 18 01:14:35 mcwk8s05 kubelet: I0418 01:14:35.118562    2985 setters.go:753] Error getting volume limit for plugin kubernetes.io/gce-pd

Apr 18 01:14:35 mcwk8s05 kubelet: I0418 01:14:35.118568    2985 setters.go:753] Error getting volume limit for plugin kubernetes.io/cinder

Apr 18 01:14:35 mcwk8s05 kubelet: I0418 01:14:35.118573    2985 setters.go:753] Error getting volume limit for plugin kubernetes.io/aws-ebs

Apr 18 01:14:35 mcwk8s05 kubelet: I0418 01:14:35.118591    2985 kubelet_node_status.go:471] Recording NodeHasSufficientMemory event message for node mcwk8s05

Apr 18 01:14:35 mcwk8s05 kubelet: I0418 01:14:35.118605    2985 kubelet_node_status.go:471] Recording NodeHasNoDiskPressure event message for node mcwk8s05

Apr 18 01:14:35 mcwk8s05 kubelet: I0418 01:14:35.118628    2985 kubelet_node_status.go:471] Recording NodeHasSufficientPID event message for node mcwk8s05

Apr 18 01:14:35 mcwk8s05 kubelet: I0418 01:14:35.118644    2985 kubelet_node_status.go:72] Attempting to register node mcwk8s05

Apr 18 01:14:35 mcwk8s05 kubelet: I0418 01:14:35.118645    2985 event.go:258] Event(v1.ObjectReference{Kind:"Node", Namespace:"", Name:"mcwk8s05", UID:"mcwk8s05", APIVersion:"", ResourceVersion:"", FieldPath:""}): type: 'Normal' reason: 'NodeHasSufficientMemory' Node mcwk8s05 status is now: NodeHasSufficientMemory

Apr 18 01:14:35 mcwk8s05 kubelet: I0418 01:14:35.118671    2985 event.go:258] Event(v1.ObjectReference{Kind:"Node", Namespace:"", Name:"mcwk8s05", UID:"mcwk8s05", APIVersion:"", ResourceVersion:"", FieldPath:""}): type: 'Normal' reason: 'NodeHasNoDiskPressure' Node mcwk8s05 status is now: NodeHasNoDiskPressure

Apr 18 01:14:35 mcwk8s05 kubelet: I0418 01:14:35.118701    2985 event.go:258] Event(v1.ObjectReference{Kind:"Node", Namespace:"", Name:"mcwk8s05", UID:"mcwk8s05", APIVersion:"", ResourceVersion:"", FieldPath:""}): type: 'Normal' reason: 'NodeHasSufficientPID' Node mcwk8s05 status is now: NodeHasSufficientPID

Apr 18 01:14:35 mcwk8s05 kubelet: I0418 01:14:35.129924    2985 kubelet.go:1973] SyncLoop (housekeeping, skipped): sources aren't ready yet.

Apr 18 01:14:35 mcwk8s05 kubelet: E0418 01:14:35.194840    2985 kubelet.go:2252] node "mcwk8s05" not found

Apr 18 01:14:35 mcwk8s05 kubelet: E0418 01:14:35.295918    2985 kubelet.go:2252] node "mcwk8s05" not found

Apr 18 01:14:37 mcwk8s05 kubelet: E0418 01:14:37.012374    2985 kubelet.go:2252] node "mcwk8s05" not found

Apr 18 01:14:37 mcwk8s05 kube-proxy: E0418 01:14:37.109904    1006 reflector.go:125] k8s.io/client-go/informers/factory.go:133: Failed to list *v1.Service: Get https://10.0.0.30:6443/api/v1/services?labelSelector=%21service.kubernetes.io%2Fservice-proxy-name&limit=500&resourceVersion=0: dial tcp 10.0.0.30:6443: connect: no route to host

Apr 18 01:14:37 mcwk8s05 kube-proxy: E0418 01:14:37.109992    1006 reflector.go:125] k8s.io/client-go/informers/factory.go:133: Failed to list *v1.Endpoints: Get https://10.0.0.30:6443/api/v1/endpoints?labelSelector=%21service.kubernetes.io%2Fservice-proxy-name&limit=500&resourceVersion=0: dial tcp 10.0.0.30:6443: connect: no route to host

Apr 18 01:14:37 mcwk8s05 kubelet: E0418 01:14:37.110082    2985 kubelet_node_status.go:94] Unable to register node "mcwk8s05" with API server: Post https://10.0.0.30:6443/api/v1/nodes: dial tcp 10.0.0.30:6443: connect: no route to host

Apr 18 01:14:37 mcwk8s05 kubelet: E0418 01:14:37.110127    2985 reflector.go:125] k8s.io/kubernetes/pkg/kubelet/kubelet.go:454: Failed to list *v1.Node: Get https://10.0.0.30:6443/api/v1/nodes?fieldSelector=metadata.name%3Dmcwk8s05&limit=500&resourceVersion=0: dial tcp 10.0.0.30:6443: connect: no route to host

在两个nginx服务器上启动nginx进程。启动高可用

[root@mcwk8s01 ~]# ps -ef|grep nginx

root       1575   1416  0 01:17 pts/0    00:00:00 grep --color=auto nginx

[root@mcwk8s01 ~]# nginx

[root@mcwk8s01 ~]# systemctl start keepalived.service

[root@mcwk8s01 ~]#

然后查看node，已经成为准备状态，可以正常使用了

[root@mcwk8s03 ~]# kubectl get nodes

NAME       STATUS   ROLES    AGE    VERSION

mcwk8s05   Ready    <none>   166d   v1.15.12

mcwk8s06   Ready    <none>   166d   v1.15.12

[root@mcwk8s03 ~]#

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docker/k8s常见错误处理

启动docker失败，报错了

一次k8s的node 是not ready的排查

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